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RA 3-pole ground resistance measurement (IEC 1557-5)
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| Measuring Voltage | Fluke 1623 | Vm = 48 V ac |
| Fluke 1625 | Vm = 20/48 V ac | |
| Short circuit current | Fluke 1623 | > 50 mA |
| Fluke 1625 | 250 mA ac | |
| Measure frequency | Fluke 1623 | 128 Hz |
| Fluke 1625 | 94, 105, 111, 128Hz | |
| Resolution | Fluke 1623 | 0.001 Ω to 10 Ω |
| Fluke 1625 | 0.001 Ω to 100 Ω | |
| Measuring range | Fluke 1623 | 0.001 Ω to 19.99 kΩ |
| Fluke 1625 | 0.001 Ω to 299.9 kΩ | |
| Intrinsic error | Fluke 1623 | ± (2 % of reading + 3 digit) |
| Fluke 1625 | ± (2 % of reading + 2 d) | |
| Operating error | Fluke 1623 | ± (5 % of reading + 3 d) |
| Fluke 1625 | ± (5 % of reading + 5 d) | |
| RA 4-pole ground resistance measurement (IEC 1557-5) | ||
| Measuring Voltage | Fluke 1623 | Vm = 48 V ac |
| Fluke 1625 | Vm = 20/48 V ac | |
| Short circuit current | Fluke 1623 | > 50 mA |
| Fluke 1625 | 250 mA ac | |
| Measure frequency | Fluke 1623 | 128 Hz |
| Fluke 1625 | 94, 105, 111, 128Hz | |
| Resolution | Fluke 1623 | 0.001 Ω to 10 Ω |
| Fluke 1625 | 0.001 Ω to 100 Ω | |
| Measuring range | Fluke 1623 | 0.001 Ω to 19.99 kΩ |
| Fluke 1625 | 0.001 Ω to 299.9 kΩ | |
| Intrinsic error | Fluke 1623 | ± (2 % of reading + 3 d) |
| Fluke 1625 | ± (2 % of reading + 2 d) | |
| Operating error | Fluke 1623 | ± (5 % of reading + 3 d) |
| Fluke 1625 | ± (5 % of reading + 5 d) | |
| RA 3-pole ground resistance measurement with current clamp | ||
| Measuring Voltage | Fluke 1623 | Vm = 48 V ac |
| Fluke 1625 | Vm = 20/48 V ac | |
| Short circuit current | Fluke 1623 | > 50 mA |
| Fluke 1625 | 250 mA ac | |
| Measure frequency | Fluke 1623 | 128 Hz |
| Fluke 1625 | 94, 105, 111, 128Hz | |
| Resolution | Fluke 1623 | 0.001 Ω to 10 Ω |
| Fluke 1625 | 0.001 Ω to 10 Ω | |
| Measuring range | Fluke 1623 | 0.001 Ω to 19.99 kΩ |
| Fluke 1625 | 0.001 Ω to 29.99 kΩ | |
| Intrinsic error | Fluke 1623 | ± (7 % of reading + 3 d) |
| Fluke 1625 | ± (7 % of reading + 2 d) | |
| Operating error | Fluke 1623 | ± (10 % of reading + 5 d) |
| Fluke 1625 | ± (10 % of reading + 5 d) | |
| RA 4-pole selective ground resistance measurement with current clamp | ||
| Measuring Voltage | Fluke 1623 | Vm = 48 V ac |
| Fluke 1625 | Vm = 20/48 V ac | |
| Short circuit current | Fluke 1623 | > 50 mA |
| Fluke 1625 | 250 mA ac | |
| Measure frequency | Fluke 1623 | 128 Hz |
| Fluke 1625 | 94, 105, 111, 128Hz | |
| Resolution | Fluke 1623 | 0.001 Ω to 10 Ω |
| Fluke 1625 | 0.001 Ω to 10 Ω | |
| Measuring range | Fluke 1623 | 0.001 Ω to 19.99 kΩ |
| Fluke 1625 | 0.001 Ω to 29.99 kΩ | |
| Intrinsic error | Fluke 1623 | ± (7 % of reading + 3 d) |
| Fluke 1625 | ± (7 % of reading + 2 d) | |
| Operating error | Fluke 1623 | ± (10 % of reading + 5 d) |
| Fluke 1625 | ± (10 % of reading + 5 d) | |
| Stakeless ground loop measurement | ||
| Measuring Voltage | Fluke 1623 | Vm = 48 V ac |
| Fluke 1625 | Vm = 20/48 V ac | |
| Measure frequency | Fluke 1623 | 128 Hz (125 Hz on request) |
| Fluke 1625 | 94, 105, 111, 128Hz | |
| Noise current (Iext) | Fluke 1623 | Max. Iext = 10 A (ac) (RA < 20 Ω) |
| Max. Iext = 2 A (ac) (RA < 20 Ω) | ||
| Fluke 1625 | Max. Iext = 3 A | |
| Resolution | Fluke 1623 | 0.001 Ω to 0.1 Ω |
| Fluke 1625 | 0.001 Ω to 10 Ω | |
| Measuring range | Fluke 1623 | 0.001 Ω to 199.9 kΩ |
| Fluke 1625 | 0.001 Ω to 29.99 kΩ | |
| Intrinsic error | Fluke 1623 | ± (7 % of reading + 3 d) |
| Fluke 1625 | ± (7 % of reading + 2 d) | |
| Operating error | Fluke 1623 | ± (10 % of reading + 5 d) |
| Fluke 1625 | ± (10 % of reading + 5 d) | |
| Environmental Specifications | ||
| Working temperature | -10 °C to +50 °C | |
| Operating Temperature | 0 °C to +35 °C | |
| Nominal temperature | +18 °C to +28 °C | |
| Storage Temperature | Fluke 1623 | -20 °C to +60 °C |
| Fluke 1625 | -30 °C to +60 °C | |
| Climatic class | C1 (IEC 654-1), -5 °C to + 45 °C, 5 % to 95 % RH | |
| Protection type | IP56 for case, IP40 for battery door according to EN 60529 | |
| Safety Specifications | ||
| Safety Rating | CAT II, 300 V | |
| Mechanical & General Specifications | ||
| Display | Fluke 1623 | 1999 digit LCD – display with special symbols, digit height 25 mm, fluorescent backlight |
| Fluke 1625 | 2999 Digit LCD – 7 segment liquid crystal display with special symbols and backlight | |
| Size | 133 mm x 187 mm x 250 mm | |
| Weight | Fluke 1623 + 1625 | 1.1 kg (including batteries) |
| Warranty | Two years | |
| Battery Life | Fluke 1623 | Typical > 3000 measurements |
| Fluke 1625 | Typical 3000 measurements (RE+RH ≤ 1 kΩ) | |
| Typical 6000 measurements (RE+RH ≤ 10 kΩ) | ||
